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Наименование:

OFDM for Mobile Communications Systems. Efficient Modulations and Techniques

Формат:      Страниц 132
     мягкая обложка
Автор:
Mutamed K.    
Издательство:
Книга по Требованию    
Год:2011
Цена:
2261 руб
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It will focus on post-detection combining systems and study the effect of diversity, fading severity and sensitivity of channel correlation for the various signaling systems. It will study the performance of non-coherent OFDM modulations over generalized mobile radio fading channels with correlated branches, based on balance incomplete block design. Current cellular communications systems have adopted digital technology. This book describes diversity schemes in which signal processing at the receiver is combined, where it is possible to design systems in which the reliability/throughput far exceeds systems in use today. However, the major services they provide are limited to basic services, such as voice, and relatively low-bit-rate data. We are now in the 21st century, where the demands for a variety of wideband services such as high-speed Internet access and video/high-quality image transmission, will continue to increase. The third-generation mobile communication system based on wideband CDMA has been designed to support wideband services at data rates with the same quality as fixed networks.
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Технология WiMax
Роуминг позволяет при передвижении абонента на скорости до 120 км/ч «бесшовно» переключаться между базовыми станциями (точно так же как это происходит в сетях сотовой связи). В мобильном WiMAX применяется Scalable OFDMA — масштабируемый OFDM-доступ и возможна работа как в условиях прямой видимости так в ее отсутствие. Для сетей Mobile WiMAX выделяются частотные диапазоны: 2,3–2,5; 2,5–2,7; 3,4–3,8 ГГц. На сегодняшний день в мире реализованы и успешно функционируют беспроводные широкополосные сети на основе Mobile WiMAX, в том числе первыми в России свои сети развернули компании «Скартел» — бренд Yo a (сети построены в Москве, Санкт-Петербурге, Уфе, Краснодаре, Сочи, Никарагуа) и Комстар O C (сеть в Москве). Конкурентами 802.16e являются все мобильные технологии третьего поколения 3G, например, EV-DO. И если стандарт IEEE 802.16d является протоколом операторского класса, то мобильный WiMAX ориентирован на конечных пользователей, и в данном случае он представляет собой альтернативу стандартам 802.11 a/b/g. Имея ноутбук или КПК со встроенным WiMAX модемом, и подключившись к сети, пользователь сможет постоянно оставаться на связи в любой точке города, где обеспечивается зона покрытия WiMAX сети.


The Analysis of the Critical Factors that Affect Consumers' Willingness. To Adopt 3G Mobile Communication Systems Книга по Требованию
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